21112641937 has 2 divisors, whose sum is σ = 21112641938. Its totient is φ = 21112641936.

The previous prime is 21112641931. The next prime is 21112641983. The reversal of 21112641937 is 73914621112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20041781761 + 1070860176 = 141569^2 + 32724^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112641937 - 2²³ = 21104253329 is a prime.

It is a super-2 number, since 2×21112641937² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112641896 and 21112641905.

It is not a weakly prime, because it can be changed into another prime (21112641931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556320968 + 10556320969.

It is an arithmetic number, because the mean of its divisors is an integer number (10556320969).

Almost surely, 2^21112641937 is an apocalyptic number.

It is an amenable number.

21112641937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112641937 is an equidigital number, since it uses as much as digits as its factorization.

21112641937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The spelling of 21112641937 in words is "twenty-one billion, one hundred twelve million, six hundred forty-one thousand, nine hundred thirty-seven".